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Water 2018, 10(4), 401; https://doi.org/10.3390/w10040401

Geometrical Characterization of Sediment Deposits at the Confluence of Mountain Streams

Department of Civil Engineering and Architecture, University of Catania, Via Santa Sofia 64, 95125 Catania, Italy
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Received: 20 February 2018 / Revised: 21 March 2018 / Accepted: 26 March 2018 / Published: 29 March 2018
(This article belongs to the Special Issue Erosion and Torrent Control)
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Abstract

Debris flow injections from tributaries into a main mountain stream generate deposits of sediments which, in turn, result in obstruction and eventual damming of the river section. This contribution presents the results of a series of flume experiments on the dynamics of these deposits, with reference to three different types of blockage: no blockage, partial blockage, and full blockage. Results show that the shape of the deposit is mainly controlled by the ratio between the debris flow discharge and the main river discharge. The experimental dataset is used to develop a deposit resilience stability index based on the shape of the deposit contour retrieved from photos taken from above. The proposed index is based on the invariant elliptic Fourier coefficients and the dimensionless transverse obstruction parameter. The elliptic Fourier coefficients give information on the symmetry of the deposit contour. High symmetry indicates more stable and resilient deposits. The proposed index is calibrated on the basis of the flume experiments and tested with field data. The results are quite promising and suggest that the index can be appropriate for a fast hazard assessment of multiple debris flow deposits at a regional scale. View Full-Text
Keywords: debris flow; deposit; hazard; shape analysis; mountain confluence; dam debris flow; deposit; hazard; shape analysis; mountain confluence; dam
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Stancanelli, L.M.; Musumeci, R.E. Geometrical Characterization of Sediment Deposits at the Confluence of Mountain Streams. Water 2018, 10, 401.

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